Book Maths Puzzle Percentage

A petroleum company has two different sources for crude oil. The first source provides oil that is 60% pure, and the second one provides oil that is 85% pure. In order to obtain 80

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How do you solve this problem?
X=(200-P)+(50-(P/2)) I need help on solving linear equations with abslute value's in them the problem is 3[y+51]-15=6 []used to represent abslute value brackets. I dont need the answer I just need help